Sedimentary characteristics and its palaeoenvironmental significance of the Upper Devonian storm deposits at Qingfengxia section in Guangyuan City,Sichuan Province
Huang Cheng1,2, Shen Yu-Wei1,2, Wen Xin3
1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China; 2 The Laboratory of Carbonate Sedimentary and Diagenetic Geochemistry,Southwest Petroleum University, Chengdu 610500, China; 3 Exploration Division of PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China
Abstract：It is well known that environmental changes during the Devonian Givetian-Frasnian(G-F) transition initiated the beginning of the Late Devonian extinction. However,it is still controversial as to the understanding of environmental changes in this period. For that,this study conducted detailed sedimentological study on six sets of tempestites in the Devonian Guanwushan Formation at the Qingfengxia section in Guangyuan City,Sichuan Province,China. Some typical storm depositional indicators,including erosional structures,coarse lag deposits,graded bedding,and hummocky cross-stratification were identified. Three proximal storm sedimentary sequences have been established based on the combined characteristics of storm sedimentary structures in the Guanwushan Formation. Storm sequence Ⅰ consists of calcirudites with erosional surface at the bottom and homogeneous mudstones at the top. Storm sequence Ⅱ is characterized by calcirudites with erosional surface at the bottom and calcarenites with graded bedding at the top. Storm sequence Ⅲ is composed of calcirudites with erosional surface at the bottom,coquinas with graded bedding in the middle interval,hummocky cross-stratificated wackestones in the upper part,and mudstones with wavy and horizontal beddings at the top. The tempestites were formed in the early Frasnian age according to the biochronological analysis of conodont assemblages. Based on the analysis of origin of modern storms,the widely distributed tempestites in early Frasnian age at the low-latitude areas might have resulted from climate warming and rapid transgression. Discovery of tempestites in the study area is of great significance in understanding of the Late Devonian sedimentary environment, palaeogeography,and palaeoclimate in the upper Yangtze region.
Huang Cheng,Shen Yu-Wei,Wen Xin. Sedimentary characteristics and its palaeoenvironmental significance of the Upper Devonian storm deposits at Qingfengxia section in Guangyuan City,Sichuan Province[J]. JOPC, 2021, 23(6): 1094-1109.
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